Personalized PageRank. Given a friendship \((v_s,v_t)\in \mathcal {E} \) , this measure aims to preserve intricate topological relations between nodes by performing random walks. In particular, the personalized PageRank [1]} from \(v_s\)  to \(v_t\)  is defined as the probability that a random walk with restart (RWR) [2]} originating from \(v_s\)  stops at \(v_t\) . The corresponding RWR starts from the source \(v_s\)  and, in each step, chooses to (i) either terminate at the current node with probability \(\alpha \) , (ii) or navigate to a random target neighbor of the current node with the remaining \(1-\alpha \)  probability.
